Need help in calculating


I am developing an assessment software for which I need the help for calculating the results. I have mentioned a scenario below.

Option1: 0% to 15%
Option2: 15% to 45%
Option3: 45% to 60%
Option4: 60% to 75%
Option 5: 75% to 100%

In a category, there are 10 questions.
Each questions has 5 options as mentioned above from which only one option can be selected.
User has answered all the 10 questions. Depending on the different options selected by the user for all the 10 questions. I need to find out to which option the category will below to.